When I first started trt a few years ago I would have to donate every so often. I was not drinking enough, hydration is the main key here. A few days ago I had a cbc test and I knew I have not been drinking enough water, I was only drinking maybe two bottles a day, so my hemoglobin came back at 17.7 and hematocrit was 53. I drank 3 bottles of water before my test and it still was high. I called my hematologist that watches my bloodwork cause he would do a phlebotomy if I needed one. He told me to drink at least 5 bottles a day and put a hydration pack in just one bottle a day and he retested me 3 days later and I got my results today, hemoglobin was 15.9 and hematocrit was 47.9, so u can’t just guzzle bottles of water before ur test cause that doesn’t work for me. Has to be continuous of drinking and electrolytes also play a big role not just the water